Oregon's preparations for Saturday's home game against Nebraska have been altered by air quality so "hazardous" that local agencies have issued an alert for residents.

The Ducks will travel an hour to the coast Tuesday morning and practice at Siuslaw Middle School in Florence. The workout is closed to the public and media.

The Lane Regional Air Protection Agency has not recorded levels of particulate matter to this degree since it began measuring for it in 1999, spokeswoman Jo Niehaus said Monday afternoon, and air quality is "absolutely in the hazardous" range, she said.

Four wildfires, or wildfire complexes, larger than 20,000 acres are currently blazing in the state, according to the Oregon Department of Forestry. The state has been hit by high temperatures, as well. It was 90 degrees at kickoff Saturday during Oregon's season opener against Southern Utah, marking just the fifth time in Autzen Stadium history that the temperature was above 90 at kickoff.